﻿<blockquote class="extDef">
NOTE&nbsp; Definition according to ISO/CD 10303-41:1992<br>
 The dimensionality of any quantity can be expressed as a product of powers of the dimensions of base quantities. 
The dimensional exponents entity defines the powers of the dimensions of the base quantities. All the physical 
quantities are founded on seven base quantities (ISO 31 (clause 2)).</blockquote>

<blockquote class="note">
NOTE&nbsp; Length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven base quantities.
</blockquote>

<blockquote class="example">
EXAMPLE&nbsp; A length of 2 millimetres has a length exponent of 1. The remaining exponents are equal to 0.
</blockquote>

<blockquote class="example">
EXAMPLE&nbsp; A velocity of 2 millimetres per second has a length exponent of 1 and a time exponent of -1. The remaining exponents are equal to 0.
</blockquote>

<blockquote class="note">
NOTE&nbsp; Corresponding STEP name: dimensional_exponents, please refer to ISO/IS 10303-41 for the final definition of the formal standard.
</blockquote>

<blockquote class="history">
HISTORY&nbsp; New entity in IFC1.5.1. 
</blockquote>